Improvement in reversible knob-latches



B. ERBE.

REVERSIBLE KNOBLLA'I'CH;

No.17,Z,9Z0. Patented Feb. 1, 1876.

MA EEEEE- I v vhvrzl lrm UN TED STATES PATENT OFFICE- BARIHEL ERBE, OF PITTSBUBG, PENNSYLVANIA.-

IMPROVEMENT IN REVERSIBLE KNOB-LATCH ES. I

Specification forming part of Letters Patent No. 172,920, dated February 1, 1876; application filed January 3, 1876.

To all whom it may concern.-

Be it known that I, BARTHEL ERBE, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Reversible. Knob- Latches; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing forming part of this specification, in which- Figure 1 is a side view of my improved latch the covering-plate being partly broken away, showing the position of the several parts when in use; and Fig. 2 is alike view, showing the position of the several parts when the latch is ready for reversal.

Like letters of reference indicate like parts in each.

My invention relates to that class of latches known as reversible knob-latches, in which the bevel of the bolt can be set in either direction so as to make the latch answer fora right or left hand door; and it consists in attaching the latch-bolt to a pivoted arm or lever, upon which lever the yoke-arm catches, and operates the bolt, so that by changing the position of the yoke-arm upon the lever suflicieut play is given to the bolt to free the square portion from the front part of the case, thus allowing of its reversal.

To enable others skilled in the art to make and use my invention, I will describe its construction and operation.

In the drawing referred to, A is the latchbolt, having the usual bevel on one side, and the square portion that fits in the front part (of the case B. The bolt A is provided with the cylindrical stem a, terminating in the shank 0, of less diameter than the stem, thereby forming a shoulder, a, said shank being provided with the head (1. Pivoted at e is the arm or lever E, said lever engaging the shank of the bolt A by means of the recess 6. Upon the side of the lever E is the lug or projection e, which engages with the lug on the yoke-arm. F is the spindle-yoke, provided with the yoke-arms f f the arm fengaging and operating the lever E by means of the lug i, or in any other suitable manner. H is the hub, and K the spring, working against and change its position on the lever E, thus giving sufficient play to the bolt to free the square portion from the front of the case, as shown in Fig. 2, and allowing of its reversal. vWhen the bolt has been reversed the lock is turned to its original position, the bolt again pressed into the case and the yoke-arm falls to its former position on the pivoted lever,

thus shortening the throw of the lever and re-' taining the square portion of the bolt within the case. I

When the latch-case is attached to a door or other place, the screw passing through the screw-hole h, precludes the possibility of the yokearm f rising so as -to permit the accidental reversal of the bolt, but the weight of the yoke is,'under most circumstances, sufficient for the purpose specified without the screw or other adjuncts.

It is evident that the yoke-arm f may be retained in position onthe pivoted arm E by other means than the lug or projection 0 and therefore I do not limit myself thereto.

What I claim as my invention, and desire to secure by Letters Patent, is

'The combination of the pivoted lever and yoke -arm, relatively arranged so that by changing the position of the yoke-arm upon the lever snfficient play is obtained to free the square portion of the, bolt, and to allow of its reversal, substantially as described.

In testimony whereof I, the said BABTHEL ERBE, have hereunto set my .hand.

BAR'IHEL ERBE.

Witnesses:

T. B. KERR, JAMES I. KAY. 

